refactor: remove GUARDIANS constant, consolidate into guardian-data.ts

- Delete src/lib/game/constants/guardians.ts (the old static GUARDIANS constant)
- Create src/lib/game/data/guardian-data.ts with BASE_GUARDIANS (same data, new home)
- Remove GUARDIANS export from constants/index.ts
- Update all 11 files that imported GUARDIANS to use getGuardianForFloor() or BASE_GUARDIANS:
  - useGameDerived.ts, combat-actions.ts, gameStore.ts, prestigeStore.ts
  - combat-utils.ts, room-utils.ts, floor-utils.ts, spire-utils.ts
  - SpireCombatPage.tsx, SpireHeader.tsx
- Update 4 test files to use getGuardianForFloor() instead of GUARDIANS constant
- guardian-encounters.ts now imports BASE_GUARDIANS from guardian-data.ts
- Split room-utils.test.ts (505 lines) into room-utils.test.ts + room-utils-floor-state.test.ts

src/lib/game/data/guardian-encounters.ts

@@ -265,27 +265,24 @@ export function getExtendedGuardian(floor: number): GuardianDef | null {
 }
 
 // ─── Unified Guardian System ─────────────────────────────────────────────────
-// Merges the static GUARDIANS constant (floors 10–100) with the extended
-// procedural system (compound 110, exotic 120–140, combo 150+).
-// For floors 90–100 the static definitions take precedence (canonical names).
+// Merges the base guardians (floors 10–100) with the extended procedural system
+// (compound 110, exotic 120–140, combo 150+).
 
-import { GUARDIANS } from '../constants/guardians';
+import { BASE_GUARDIANS } from './guardian-data';
 
 /** Get the guardian for any floor, merging static and extended systems. */
 export function getGuardianForFloor(floor: number): GuardianDef | null {
-  // Static GUARDIANS take precedence for floors 10–100 (canonical definitions)
-  if (GUARDIANS[floor]) {
-    return { ...GUARDIANS[floor] };
+  if (BASE_GUARDIANS[floor]) {
+    return { ...BASE_GUARDIANS[floor] };
   }
-  // Extended system for floors beyond 100 (and compound floors not in GUARDIANS)
   return getExtendedGuardian(floor);
 }
 
-/** All guardian floors — merged from static + extended. */
+/** All guardian floors — merged from base + extended. */
 export function getAllGuardianFloors(): number[] {
-  const staticFloors = Object.keys(GUARDIANS).map(Number);
+  const baseFloors = Object.keys(BASE_GUARDIANS).map(Number);
   const extendedFloors = [110, 120, 130, 140, ...Array.from({ length: 10 }, (_, i) => 150 + i * 10)];
-  const all = new Set([...staticFloors, ...extendedFloors]);
+  const all = new Set([...baseFloors, ...extendedFloors]);
   return Array.from(all).sort((a, b) => a - b);
 }